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My question is related to this questionthis question but it is not the same. Consider the US stock market. How can I tell if people trading in this market hold properly diversified portfolios? Is there some literature on this? I cannot find anything.

My question is related to this question but it is not the same. Consider the US stock market. How can I tell if people trading in this market hold properly diversified portfolios? Is there some literature on this? I cannot find anything.

My question is related to this question but it is not the same. Consider the US stock market. How can I tell if people trading in this market hold properly diversified portfolios? Is there some literature on this? I cannot find anything.

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How to measure if investors are diversified in a stock market?

My question is related to this question but it is not the same. Consider the US stock market. How can I tell if people trading in this market hold properly diversified portfolios? Is there some literature on this? I cannot find anything.